Haapajärvi is a town and municipality of Finland. It is located in the province of Oulu and is part of the Northern Ostrobothnia region. The town has a population of 6,657 (28 February 2023) and covers an area of 789.11 square kilometres (304.68 sq mi) of which 23.44 km2 (9.05 sq mi) is water. The population density is 8.69 inhabitants per square kilometre (22.5/sq mi). Neighbour municipalities are Haapavesi, Kärsämäki, Nivala, Pihtipudas, Pyhäjärvi, Reisjärvi and Sievi. The municipality is unilingually Finnish. More information...
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